JPH086770B2 - Friction coupling assembly and its friction piece - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a drum, a set of circumferentially arranged friction pieces and an annular fluid for radially actuating the friction pieces. Coupling assembly comprising extensible tubes or bag-like elements, in particular a set having a series of friction bars with intricately formed driving bars on each friction bar working with corresponding grooves formed in the tube Regarding solids.

Prior Art Collins and other US Pat. No. 4,190,136 and Fawick US Pat.
No. 77, which discloses a clutch or brake assembly that uses a series of friction strips that are attached to a fluid extensible tube and that are radially actuated by the fluid. However, the friction strips in these patents consist of a backing plate with a void for cooling and a friction pad riveted to the backing plate with a considerable spacing between the tubes. The protrusion on the tube extends into a groove formed in the backing plate for transmitting torque from the friction piece to the tube.

[Problems to be Solved by the Invention] In the conventional friction coupling assembly described above, the friction pieces are provided at a considerable distance from each other, and the friction pad is provided on the backing plate that is considerably distant from the pipe. Since they are attached with rivets, there are disadvantages that the torque transmission efficiency is poor, the amount of heat generated per unit area of the friction surface is large, and the friction material is damaged quickly.

[Means for Solving the Problems] A friction coupling assembly of the present invention comprises a backing plate having a friction pad fixed on one side and a driving bar fixed on the other side. In the new and improved coupling assembly of the above characteristics, which has a plurality of friction pieces formed in a composite with the pad, each driving bar has a better transmission of torque from the friction pieces to the pipe, It is housed in the corresponding groove inside. In addition, a backing plate having a friction pad fixed to one side and a driving bar made of a friction material fixed to the other side in the center, and a backing plate of the backing plate for better transmission of torque from the friction piece to the pipe. There is a friction piece for a coupling with the above characteristics, with an auxiliary driving bar located at each end, at least partially of friction material.

[Operation] As described above, the coupling assembly including the inflatable annular pipe and the plurality of friction pieces attached to the pipe so as to move in the radial direction as the pipe expands and contracts, The piece has a friction pad fixed to one side of the backing plate,
A driving bar made of a friction material is fixed to the other side, and both of them are joined to form an integrated structure.The driving bar fits into a groove provided in the pipe, and the backing plate is Since both ends act as auxiliary driving bars in the groove with the ends of the other friction pieces, the torque transmission force between the friction pieces and the pipe is improved.

Embodiments Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a part of a clutch and brake assembly with parts removed from an embodiment of a friction coupling assembly according to the present invention, and FIG. 2 is taken along line 2-2 in FIG. A sectional view, FIG. 3 is a sectional view taken along line 3-3 of FIG.
FIG. 4 is a plan view of the friction piece, and FIG. 5 is a line 5-- in FIG.
FIG. 6 is an enlarged view of a cross section taken along line 5, and FIG. 6 is a partial view similar to FIG. 5 of another embodiment of the friction piece.

The coupling 10 includes a drum 11 and a rim assembly 12. The drum 11 and the rim assembly 12 can rotate around the same rotation axis. The coupling 10 can be used as a brake or a clutch. If you want to use the coupling 10 as a brake,
If one of the 11 or 12 is fixed and it is desired to use the coupling 10 as a clutch, both members 11 or 12 are rotatable. Therefore, the term coupling as used herein applies to either clutch or brake assemblies.

An annular, fluidly extensible tube or bag 14 of reinforced elastomer is provided on the annular surface 13 of the rim assembly 12.
Fixed to. The wall 16 of the tube 14 is formed by a series of axially extending lugs 18 with axially extending grooves 18 having a generally arcuate cross section.
It consists of a thick elastomer layer forming 17 therein. The grooves 18 are equally spaced around the tube 14. Each rug 17
Includes an axially extending bore 19 for the purposes discussed below.

The plurality of friction strips 20 are wall 16 of the pipe 14 through a pin 21 extending through a hole 19 in the pipe 14 and a pair of aligned holes 22 in a side flange 23 of a backing plate 24 of the friction strip 20.
It is connected to the. The pin 21 may have a head 25 fitted at one end and a removable head 26 at the other end so that any friction piece provided for replacement can be removed from the tube 14. Since each lug 17 contains only one hole 19,
Each friction piece 20 is supported by a pair of lugs 17 and pins 21 extending through adjacent holes 19 in adjacent lugs 17.

The tube 14 includes an inlet 27 that communicates with the interior of the tube 14, and when pressurized fluid is injected into the tube, the wall 16 moves radially so that the friction piece 20 contacts the outer surface of the drum 11. The drum 11 and rim assembly 12 in a known manner.
And are connected. As the pressurized fluid is expelled from within tube 14, tube 14 contracts, causing friction strip 20 to move radially away from drum 11, thereby causing the connection between drum 11 and rim assembly 12. solve.

In accordance with the present invention, the friction piece 20 is designed to maximize the torque transmission capability of the coupling and to make the structure of the friction piece 20 economical and interchangeable. As shown in FIGS. 4 and 5, the side flanges 23 and the backing plate 24 are preferably made of metal, the latter generally having an arcuate shape in the circumferential direction of the drum 11. The end 28 of the backing plate 24 extends at an angle to the backing plate 24 and may be connected to the end of the side flange 23 of the friction piece 20. There is at least one hole 29 in the center of the backing plate 24 with respect to the circumferential direction. Although the holes are shown as circular, the purpose of the holes 29 is to allow friction material to flow into the mold cavity so as to form the friction pad 31 and the driving bar 30 at the same time as the friction piece 20 is made. Thus, there may be one or more holes of rectangular or other shape. The driving bar 30 generally extends in the axial direction of the friction piece 20 from one side flange 23 to the other side flange 23. The friction material joins the driving bar 30 with the friction pad 31 and the backing plate 24 in the hole 29.

The end 33 of the friction piece 20 is made of a friction material and preferably extends radially from the contact surface 32 of the pad 31 to form the end 33. The end 33 preferably includes the end 28 of the backing plate 24 and terminates in a rounded protrusion 34 along a bond line 35. As shown in FIG. 5, the driving bar 30 preferably has an arcuate cross section. The friction piece 20 is a single structure in which the backing plate 24, the side flange 23, the driving bar 30, and the end 33 of the friction pad 31 are combined. Furthermore, the bar 30 exactly matches and supplements the cross-sectional shape of the groove 18 in the bag-like tissue tube 14, and the driving bar 30 extends with the groove 18. Also, friction pad 31
Since the end portions 33 of the adjacent friction pieces 20 also extend into the groove 18, the adjacent ends 33 of the adjacent friction pieces 20 mutually fill the common groove 18 into which the end portions 33 of the adjacent pads 31 extend. . In this way, the end of each friction piece 20 can act as a driving bar in addition to the driving bar 30 located at the center. And, the portion of the tube 14 that is exposed to the heat generated in the friction interface between the friction piece 20 and the drum 11 can be minimized.

As described above with reference to FIGS. 4 and 5, the friction material is allowed to flow from the cavity of the mold forming the friction pad 31 into the cavity of the mold forming the driving bar 30 and the driving bar 30 and the friction pad 31 are combined. There is at least one hole 29 in the backing plate 24 for a positive connection. FIG. 6 shows another structure in which one or more tabs 36 and 36a extend from the backing plate 24 and are joined to the backing plate 24 at one end along the bond line 37.
One tab 36 extends from the backing plate surface at an angle opposite that of the other tab 36a. Therefore,
As shown in FIG. 6, 36 and 36A project within the driving bar 30 so as to mechanically connect the backing plate 24 and the driving bar 30. Alternatively, the tabs 36 and 36a are formed within the driving bar 30 during the formation of the backing plate 24 and / or inside the driving bar 30 by the pressure for the molding during the molding of the friction pad 31. Combined into a continuous tab.

While the present invention has been described with respect to a tube that extends radially inward to move the friction piece radially inward relative to the rotatable drum 11, the present invention describes that the friction piece moves radially outward. Obviously, it can also be applied to couplings that come into contact with fixed or rotatable members.

[Effects of the Invention] As described above, the present invention minimizes the cost and structure by the precise fitting of the structure of the friction piece and the interface of the friction piece with the tube, and the special structure of the driving bar. At the same time that the above efficiency is maximized, the torque transmission can be maximized, the structure is simplified, and the parts can be easily replaced or repaired.

[Brief description of drawings]

FIG. 1 is a side view showing a part of a clutch and brake assembly from which parts of an embodiment of a friction coupling assembly of the present invention are removed. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 of FIG. FIG. 4 is a top view of the friction piece member. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a partial view of another embodiment of a friction strip member similar to FIG. 10 ... Friction coupling assembly, 14 ... Pipe, 16 ... Wall 17 ... Lug, 18 ... Groove, 19 ... Hole, 20 ... Friction piece, 21 ... Pin, 23 ... Flange, 24 …… Backing plate, 26 …… Head 27 …… Inlet 28 …… End of backing plate, 29 …… Hole, 30 …… Driving bar, 31 …… Friction pad, 33 …… End of friction piece.

Claims (8)

[Claims] 1. A friction coupling assembly comprising: an annular tube that is expanded by an inflating fluid; a plurality of friction pieces; and the friction piece that radiates with the tube when the tube expands or contracts. A means for removably attaching the friction piece to a circumferential surface of the tube for movement in a direction, the tubes being circumferentially spaced and laterally Each of the friction pieces has a backing plate, a pad made of a friction material fixed to one side of the backing plate, the friction piece extending across the backing plate, and the backing plate. It consists of a friction material driving bar fixed on the side opposite to the pad of the plate, the driving bar of each friction piece is located in the groove of the pipe, and the cross-sectional shape of the bar and groove is A friction coupling assembly that is adapted to any combination of the backing plate, the pad, and the driving bar to form a single structure by combining them to improve the transmission of torque between the friction piece and the pipe. . 2. The friction coupling assembly of claim 1, wherein the pad and bar friction material is coupled through at least one hole in the backing plate. 3. The friction coupling assembly of claim 1, wherein the cross section of the bar has close side faces connected by arcuate portions. 4. The friction coupling assembly of claim 3, wherein the distance between the backing plate and the arcuate portion of the driving bar is greater than the thickness of the friction pad. 5. The end of the backing plate further enhances the transfer of torque between the friction piece and the tube so that an axis is formed along the end at an angle to the body of the backing plate. The friction coupling assembly of claim 1 forming a directional flange. 6. A lateral flange of the backing plate to maximize the friction area of the pad and minimize the exposure of the tube to the heat generated in the friction interface area. The friction coupling assembly of claim 5 extending beyond the ends of the friction coupling assembly. 7. A groove in the tube is provided with a lug in the middle between the grooves, a through hole in each lug, and a through hole for connecting a friction piece to the tube. The friction coupling assembly of claim 1 forming a means for extending. 8. The friction coupling assembly of claim 7 wherein each end of each pad and backing plate extends at least partially into every other groove of said tube.